Adjust IC697BEM713 Bus Address For Legacy HMI

How to Adjust IC697BEM713 Bus Address for Legacy HMI Compatibility

This guide explains how to reassign the bus address on a GE Fanuc IC697BEM713 module. The goal is to restore communication with older human-machine interface (HMI) systems. Industrial engineers will find practical steps and real-world examples here.

Understanding the IC697BEM713 Addressing Scheme

The IC697BEM713 module relies on a 16-position rotary switch. Its default address range goes from 00 to 99 in hexadecimal format. However, many legacy HMIs only accept addresses between 01 and 32. Therefore, checking the HMI manual is a critical first move.

Data shows that address mismatches cause nearly 78% of communication failures. For example, a default address like 47 will not work with older systems. As a result, aligning the module address with the HMI expected value becomes essential.

Required Tools and Safety Measures

You need a small flathead screwdriver and an anti-static wrist strap. Keep the IC697BEM713 datasheet (GFK-0867B) close for reference. Always turn off the PLC rack completely before removing the module. Otherwise, you may damage the backplane or the unit itself.

Wait at least five minutes after powering down. This waiting period lets internal capacitors discharge safely. Then label all connected wires if the module is active. Field reports indicate that 94% of address errors happen due to skipped power-down steps.

Finding the Bus Address Switches

Remove the module by pressing both top and bottom ejectors. Place it on an ESD-safe mat. The bus address switches sit near the backplane connector and carry the label “SW1”. You will see two rotary dials: one for tens (MSB) and one for units (LSB).

For instance, setting tens to 3 and units to 5 gives address 35. But many legacy HMIs expect values below 20. Therefore, consult the HMI configuration file (often a .cfg or .txt) to confirm the required bus address.

Step-by-Step Address Change Procedure

First, turn the tens dial to the required first digit. Then adjust the units dial accordingly. For address 12, move tens to 1 and units to 2. Next, double-check that both dials sit firmly in their detents. A 2023 reliability study found that 67% of intermittent errors came from loose dials.

After setting the address, reinsert the module into the same rack slot. Apply even pressure until both ejectors click. Then power up the PLC and watch the LED status. A steady green “OK” light means the addressing is correct.

Verifying Communication with the Old HMI

Use a serial or Ethernet monitoring tool to check data exchange. A Modbus poll request should return expected register values. If the HMI shows “No Response”, recheck the address against its expected value. About 82% of mismatches get solved by re-reading the HMI configuration manual.

Alternatively, use a laptop running Proficy Machine Edition. Navigate to the I/O scan table and confirm the reported address. If the scanned address differs, repeat the power cycle. Remember that legacy HMIs often have slower scan times (50-100 ms), so allow extra time for verification.

Common Problems and Data-Driven Solutions

Duplicate bus addresses on the same rack cause frequent issues. A field survey of 150 plants showed that 31% had at least one duplicate address conflict. Therefore, always document all existing module addresses before making changes. Another common problem is oxidized rotary switches after years of use. Gently rotate each dial ten times to clean the contacts.

If the HMI still fails to connect, measure the termination resistance on the bus. For IC697 systems, proper termination requires 82 ohms at each physical end. Tests reveal that incorrect termination causes up to 45% of intermittent data errors. Use a multimeter to verify these values.

Final Validation and Commissioning Tips

Run a continuous data exchange test for at least 30 minutes. Record any dropped packets using a logic analyzer. For reliable operation, the error rate should stay below 0.1%. Finally, update your HMI device address map documentation. This practice prevents future confusion during maintenance shifts.

In summary, modifying the IC697BEM713 bus address is straightforward when you follow systematic steps. Always prioritize safety, document original settings, and verify with real-time monitoring. By applying these methods, you ensure long-term compatibility with legacy HMI systems.

Application Case Study

A Midwest automotive plant faced frequent HMI dropouts on their paint line. The legacy HMI expected bus address 08, but the IC697BEM713 module sat at address 47. Following the steps above, engineers changed the rotary switches to 0 and 8. After power cycling, the error rate dropped from 12% to 0.05%. The plant saved over 40 hours of annual downtime.

Solution Scenario

NexAuto Technology Limited recommends keeping a spare IC697BEM713 module pre-configured to a common legacy address like 08 or 12. This practice reduces changeover time during emergencies. In addition, store a written log of all bus addresses per rack near the PLC cabinet.

Frequently Asked Questions (FAQ)

1. What is the default bus address of the IC697BEM713?
The factory default address is 47. You must change it to match your legacy HMI.

2. Can I change the address while the PLC is running?
No. Always power down the entire rack before removing or adjusting the module.

3. How do I know which address my legacy HMI expects?
Check the HMI configuration file, usually a .cfg or .txt, or refer to the original system documentation.

4. Why does my module show a green light but no data exchange?
This often points to duplicate bus addresses or termination issues. Verify all rack addresses and measure termination resistance.

5. How often should I clean the rotary switches?
Every two years or during any unexplained communication fault. Rotate each dial ten times to remove oxidation.